CN110627248A - Treatment process of ultralow-concentration ammonia nitrogen wastewater - Google Patents
Treatment process of ultralow-concentration ammonia nitrogen wastewater Download PDFInfo
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- CN110627248A CN110627248A CN201810647644.8A CN201810647644A CN110627248A CN 110627248 A CN110627248 A CN 110627248A CN 201810647644 A CN201810647644 A CN 201810647644A CN 110627248 A CN110627248 A CN 110627248A
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- ammonia nitrogen
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treating Waste Gases (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses a treatment process of ultra-low concentration ammonia nitrogen wastewater, belonging to the field of ammonia nitrogen wastewater treatment. The invention adopts a stable gaseous film system to remove ammonia nitrogen, has large mass transfer driving force and high ammonia nitrogen removal efficiency. The absorption reaction of the absorption liquid to ammonia is rapid, the mass transfer rate is high, and the ammonia nitrogen in the wastewater is removed to ultra-low concentration. The stable gaseous film system is suitable for various ammonia nitrogen absorption liquids, can be adjusted according to actual ammonia nitrogen concentration, can obtain the by-product with higher concentration and purity, and the by-product can be recycled or sold externally to reduce the cost of wastewater treatment. The invention can adopt calcium hydroxide as a pH regulator, thereby greatly saving the operation and the medicament cost.
Description
Technical Field
The invention relates to a treatment process of ultralow-concentration ammonia nitrogen wastewater, belonging to the field of ammonia nitrogen wastewater treatment.
Background
The existing ammonia nitrogen removal method comprises the following steps: conventional biological denitrification, ammonia stripping, ion exchange, breakpoint chlorination and magnesium ammonium phosphate precipitation. But all the methods have great defects, wherein the biological denitrification method has long process flow, occupies much land, needs additional carbon source, and has large energy consumption and high cost; the ammonia stripping method has large energy consumption and secondary pollution; the ion exchange method has large resin consumption, difficult regeneration and high operating cost; the breakpoint chlorination method has high operating cost; the precipitation method of magnesium ammonium phosphate has larger dosage of the precipitation medicament, and the like. Therefore, the development of a high-efficiency ammonia nitrogen treatment process is urgently needed.
Disclosure of Invention
The invention provides a treatment process of ultra-low concentration ammonia nitrogen wastewater aiming at the defects of the traditional ammonia nitrogen treatment process.
The treatment process comprises the following steps:
(1) and (4) the ammonia nitrogen wastewater enters a pH adjusting tank for pH adjustment to obtain effluent of the adjusting tank.
(2) And (2) enabling the effluent of the regulating reservoir in the step (1) to enter a PP filter, removing suspended matters, and obtaining filtered effluent.
(3) And (3) introducing the filtered water in the step (2) into a stable gaseous film system, adding sulfuric acid into the stable gaseous film system to serve as an absorption liquid, and absorbing and removing ammonia nitrogen in the wastewater by using a stable gaseous film denitrification technology to obtain a deamination clear liquid with low ammonia nitrogen content and absorption liquid concentrated water rich in ammonium sulfate.
(4) And (4) allowing the deaminated clear liquid obtained in the step (3) to enter a deep reaction tank, performing deep oxidation treatment on ammonia nitrogen, further removing the ammonia nitrogen, and obtaining reaction tank outlet water which can reach the national comprehensive sewage discharge standard and is directly discharged.
(5) And (4) feeding the absorption liquid concentrated water rich in the byproduct ammonium sulfate in the step (3) into an evaporator, feeding the water condensed out by the evaporator into a deep reaction tank for further treatment, and carrying out external treatment on crystals obtained by evaporation.
Optionally, the absorption liquid in step (3) may also adopt hydrochloric acid, nitric acid, a renewable absorbent, and the like, besides sulfuric acid, and the corresponding obtained byproducts are ammonium chloride, ammonium nitrate, ammonia water, and the like.
Optionally, the deep reaction tank in the step (4) may remove ammonia nitrogen by adding sodium hypochlorite, ammonia nitrogen removal agents, and the like.
Optionally, when the pH of the ammonia nitrogen wastewater is adjusted in step (1), agents such as sodium hydroxide or calcium hydroxide can be selectively used for adjustment.
The invention (1) adopts a stable gaseous film system to remove ammonia nitrogen, has large mass transfer driving force and high ammonia nitrogen removal efficiency. The absorption reaction of the absorption liquid to ammonia is rapid, the mass transfer rate is high, and the ammonia nitrogen in the wastewater is effectively removed to the specified concentration. (2) The stable gaseous film can be suitable for various ammonia nitrogen absorption liquids, can be adjusted according to actual conditions, can obtain byproducts with higher concentration and purity, and the byproducts can be recycled or sold externally to reduce the cost of wastewater treatment. (3) Calcium hydroxide can be used as a pH regulator, so that the operation and medicament cost is greatly saved.
Drawings
FIG. 1 is a technical route diagram of a treatment process of ultra-low concentration ammonia nitrogen wastewater provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Example one
FIG. 1 is a technical scheme diagram of a treatment process for ultralow-concentration ammonia-nitrogen wastewater according to an embodiment of the present invention.
The treatment process of the ammonia nitrogen wastewater specifically comprises the following steps:
(1) and (3) the ammonia nitrogen wastewater enters a pH adjusting tank for pH adjustment, the pH is adjusted to 10-11, and the alkaline regulator can be sodium hydroxide, calcium hydroxide and the like to obtain the effluent of the adjusting tank.
(2) And (2) introducing the effluent of the regulating reservoir in the step (1) into a PP filter with the diameter of 1 mu m, and removing suspended matters to obtain filtered effluent.
(3) And (3) introducing the filtered water in the step (2) into a stable gaseous film system, adding sulfuric acid into the stable gaseous film system to serve as an absorption liquid, and absorbing and removing ammonia nitrogen in the wastewater by using a stable gaseous film denitrification technology to obtain a deamination clear liquid with low ammonia nitrogen content and absorption liquid concentrated water rich in ammonium sulfate.
(4) And (3) the deamination clear liquid in the step (3) enters a deep reaction tank, ammonia nitrogen is subjected to deep oxidation treatment, 1% -2% of sodium hypochlorite is added to further remove the ammonia nitrogen, the reaction time is 30-45min, the reaction pH is controlled to be 6-7, the effluent of the reaction tank is obtained, the pH of the effluent of the reaction tank is 6-9, the ammonia nitrogen concentration is less than 1mg/L, the effluent meets the first-level standard of the national comprehensive sewage discharge standard, and the effluent is directly discharged.
(5) And (4) feeding the absorption liquid concentrated water rich in ammonium sulfate in the step (3) into an evaporator specially designed for an ammonium sulfate aqueous solution, feeding condensed water of the evaporator into a deep reaction tank for further treatment, and performing outsourcing treatment on crystals obtained by evaporation.
Optionally, the absorption liquid in step (3) may also adopt hydrochloric acid, nitric acid, a renewable absorbent, and the like, besides sulfuric acid, and the corresponding obtained byproducts are ammonium chloride, ammonium nitrate, ammonia water, and the like.
Optionally, the deep reaction tank in the step (4) may remove ammonia nitrogen by adding sodium hypochlorite, ammonia nitrogen removal agents, and the like.
Optionally, when the pH of the ammonia nitrogen wastewater is adjusted in step (1), agents such as sodium hydroxide or calcium hydroxide can be selectively used for adjustment.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a stable gaseous film system to remove ammonia nitrogen, has large mass transfer driving force and high ammonia nitrogen removal efficiency. The absorption of the absorption liquid to ammonia is a rapid reaction, and the driving force of mass transfer is large, so that the ammonia nitrogen in the wastewater can be effectively removed to the specified concentration.
The stable gaseous film system can be suitable for various ammonia nitrogen absorption liquids, can be automatically adjusted according to actual conditions, can obtain byproducts with higher concentration and purity, and can recycle or sell the byproducts to reduce the wastewater treatment cost.
The invention can adopt calcium hydroxide as a pH regulator, thereby greatly saving the operation and the medicament cost.
Illustratively, the inlet water quality of the ammonia nitrogen wastewater is as follows: the pH value is 6.8, and the ammonia nitrogen concentration is 2258 mg/L.
The pH value is adjusted by adding calcium hydroxide, the pH value is adjusted to the value, after suspended matters are removed by a PP filter, the obtained product enters a stable gaseous film system, sulfuric acid is added to serve as absorption liquid, the ammonia nitrogen concentration of effluent of the gaseous film is 11.3mg/L, the ammonia nitrogen removal rate reaches 99.5%, the obtained product enters a deep oxidation pond, after reaction is carried out for 30min, the pH value of the effluent is 8.7, the ammonia nitrogen concentration is less than 1mg/L, and the effluent reaches the first-level standard of national comprehensive emission standard and is directly discharged.
Illustratively, the inlet water quality of the ammonia nitrogen wastewater is as follows: the pH value is 10.3, and the ammonia nitrogen concentration is 1427 mg/L.
Come pH value through the pH equalizing basin and adjust pH to 11, get into stable gaseous state membrane device after getting rid of the suspended solid through the PP filter, add sulphuric acid as the absorption liquid, gaseous state membrane system goes out water ammonia nitrogen concentration and is 8.5mg/L, ammonia nitrogen clearance reaches 99.4%, then enter into deep oxidation pond, after reaction 30min, it is 8.5 to go out water pH, ammonia nitrogen concentration is <1mg/L, it reaches national comprehensive emission standard primary standard to go out water, directly discharge.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. The treatment process of the ultra-low concentration ammonia nitrogen wastewater is characterized by comprising the following steps:
(1) the ammonia nitrogen wastewater enters a pH adjusting tank for pH adjustment to obtain effluent of the adjusting tank;
(2) enabling the effluent of the regulating reservoir in the step (1) to enter a PP filter, and removing suspended matters to obtain filtered effluent;
(3) introducing the filtered water in the step (2) into a stable gaseous film system, introducing sulfuric acid into the stable gaseous film system to serve as an absorption liquid, and removing ammonia nitrogen in the wastewater through a stable gaseous film denitrification technology to obtain a deamination clear liquid with low ammonia nitrogen content and an absorption liquid concentrated water rich in ammonium sulfate;
(4) the deamination clear liquid in the step (3) enters a deep reaction tank, ammonia nitrogen is subjected to deep oxidation treatment, the ammonia nitrogen is further removed, and reaction tank outlet water is obtained, wherein the reaction tank outlet water can reach the national comprehensive sewage discharge standard, and the outlet water is directly discharged;
(5) and (4) feeding the concentrated water of the absorption liquid rich in ammonium sulfate in the step (3) into an evaporator, feeding the condensed water of the evaporator into a deep reaction tank for further treatment, and carrying out external treatment on crystals obtained by evaporation.
2. The treatment process of the ultra-low concentration ammonia nitrogen wastewater according to claim 1, characterized in that, optionally, the absorption liquid in the step (3) can adopt hydrochloric acid, nitric acid, renewable absorbent and the like besides sulfuric acid, and the corresponding obtained byproducts are ammonium chloride, ammonium nitrate, ammonia water and the like.
3. The treatment process of the ultra-low concentration ammonia nitrogen wastewater according to claim 1, characterized in that, optionally, the deep reaction tank in the step (4) can remove ammonia nitrogen by adding sodium hypochlorite, ammonia nitrogen removal agents and the like.
4. The treatment process of the ultra-low concentration ammonia nitrogen wastewater according to claim 1, characterized in that optionally, when the pH of the ammonia nitrogen wastewater in the step (1) is adjusted, agents such as sodium hydroxide or calcium hydroxide can be selectively used for adjustment.
5. The treatment process of the ultra-low concentration ammonia nitrogen wastewater as claimed in claim 1, wherein the removal rate of the high ammonia nitrogen in the gaseous membrane deamination step is 85-99.5%.
6. The treatment process of the ultra-low concentration ammonia nitrogen wastewater according to claim 1, characterized in that the ammonia nitrogen in the effluent of the deep reaction tank is less than 1 mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810647644.8A CN110627248A (en) | 2018-06-22 | 2018-06-22 | Treatment process of ultralow-concentration ammonia nitrogen wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810647644.8A CN110627248A (en) | 2018-06-22 | 2018-06-22 | Treatment process of ultralow-concentration ammonia nitrogen wastewater |
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| CN110627248A true CN110627248A (en) | 2019-12-31 |
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| CN201810647644.8A Pending CN110627248A (en) | 2018-06-22 | 2018-06-22 | Treatment process of ultralow-concentration ammonia nitrogen wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111635086A (en) * | 2020-07-14 | 2020-09-08 | 常州时升环境工程科技有限公司 | Zero discharge system for producing ammonium salt from ammonia nitrogen-containing wastewater and treatment process thereof |
| WO2023165020A1 (en) * | 2022-03-03 | 2023-09-07 | 无锡中天固废处置有限公司 | Method for deamination treatment of ammonia-nitrogen wastewater |
-
2018
- 2018-06-22 CN CN201810647644.8A patent/CN110627248A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111635086A (en) * | 2020-07-14 | 2020-09-08 | 常州时升环境工程科技有限公司 | Zero discharge system for producing ammonium salt from ammonia nitrogen-containing wastewater and treatment process thereof |
| WO2023165020A1 (en) * | 2022-03-03 | 2023-09-07 | 无锡中天固废处置有限公司 | Method for deamination treatment of ammonia-nitrogen wastewater |
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Application publication date: 20191231 |
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| WD01 | Invention patent application deemed withdrawn after publication |